Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments. Elementary instruction in practical mechanical drawing. Together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1889)
that angle to edges B and C. That in re 4 is called a triangle of 60 degrees, itsbeing at 60 degrees to B, and at 30 degrees to C. Theedges P and C are at a right angle or an angle of 90degrees in both figures ; hence they are in this respectalike. By means of these triangles alone, a greatmany… … in Figure 5, in which the triangle, Figure 3, is shown in positions marked D E F, and that shown in 4 is shown in three positions, marked respectively G H and I. It is obvious, however, that by turning r, end for end, another position is attained. The usefulness in these particular triangles is…
Mechanical drawing
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